# stream_socket_client

(PHP 5, PHP 7, PHP 8)

stream_socket_client — Open Internet or Unix domain socket connection

### Beschreibung

stream_socket_client(
string `$address`,
int `&$error_code` = `null`,
string `&$error_message` = `null`,
?float `$timeout` = `null`,
int `$flags` = `STREAM_CLIENT_CONNECT`,
?resource `$context` = `null`
): resource|false

Initiates a stream or datagram connection to the destination specified by `address`. The type of socket created is determined by the transport specified using standard URL formatting: `transport://target`. For Internet Domain sockets (AF_INET) such as TCP and UDP, the `target` portion of the `address` parameter should consist of a hostname or IP address followed by a colon and a port number. For Unix domain sockets, the `target` portion should point to the socket file on the filesystem.

> Hinweis:

> The stream will by default be opened in blocking mode. You can switch it to non-blocking mode by using stream_set_blocking().

### Parameter-Liste

`address`

  Address to the socket to connect to.

`error_code`

  Will be set to the system level error number if connection fails.

`error_message`

  Will be set to the system level error message if the connection fails.

`timeout`

  Number of seconds until the `connect()` system call should timeout. By default, default_socket_timeout is used.

  > Hinweis: This parameter only applies when not making asynchronous connection attempts.

  > Hinweis:

  > To set a timeout for reading/writing data over the socket, use the stream_set_timeout(), as the `timeout` only applies while making connecting the socket.

`flags`

  Bitmask field which may be set to any combination of connection flags. Currently the select of connection flags is limited to `STREAM_CLIENT_CONNECT` (default), `STREAM_CLIENT_ASYNC_CONNECT` and `STREAM_CLIENT_PERSISTENT`.

`context`

  A valid context resource created with stream_context_create().

### Rückgabewerte

On success a stream resource is returned which may be used together with the other file functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()), `false` on failure.

### Fehler/Exceptions

On failure the `error_code` and `error_message` arguments will be populated with the actual system level error that occurred in the system-level `connect()` call. If the value returned in `error_code` is `0` and the function returned `false`, it is an indication that the error occurred before the `connect()` call. This is most likely due to a problem initializing the socket. Note that the `error_code` and `error_message` arguments will always be passed by reference.

### Changelog

Version | Beschreibung
--- | ---
8.0.0 | `timeout` and `context` are now nullable.

### Beispiele

Beispiel #1 stream_socket_client() example

`<?php
$fp = stream_socket_client("tcp://www.example.com:80", $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />\n";
} else {
fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n");
while (!feof($fp)) {
echo fgets($fp, 1024);
}
fclose($fp);
}
?>`

Beispiel #2 Using UDP connection

Retrieving the day and time from the UDP service "daytime" (port 13) on localhost.

`<?php
$fp = stream_socket_client("udp://127.0.0.1:13", $errno, $errstr);
if (!$fp) {
echo "ERROR: $errno - $errstr<br />\n";
} else {
fwrite($fp, "\n");
echo fread($fp, 26);
fclose($fp);
}
?>`

### Anmerkungen

Warnung

UDP sockets will sometimes appear to have opened without an error, even if the remote host is unreachable. The error will only become apparent when you read or write data to/from the socket. The reason for this is because UDP is a "connectionless" protocol, which means that the operating system does not try to establish a link for the socket until it actually needs to send or receive data.

> Hinweis: Wenn Sie eine numerische IPv6-Adresse angeben, z. B. `fe80::1`, müssen Sie die IP in eckige Klammern schreiben, z. B. `tcp://[fe80::1]:80`.

> Hinweis:

> Depending on the environment, the Unix domain or the optional connect timeout may not be available. A list of available transports can be retrieved using stream_get_transports(). See Liste der unterstützten Socket-Transporter for a list of built in transports.

### Siehe auch

- stream_socket_server() - Create an Internet or Unix domain server socket
- stream_set_blocking() - Set blocking/non-blocking mode on a stream
- stream_set_timeout() - Set timeout period on a stream
- stream_select() - Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by seconds and microseconds
- fgets() - Liest die Zeile von der Position des Dateizeigers
- fgetss() - Liest eine Zeile von der Position des Dateizeigers und entfernt HTML Tags.
- fwrite() - Binär-sicheres Dateischreiben
- fclose() - Schließt einen offenen Dateizeiger
- feof() - Prüft, ob ein Dateizeiger am Ende der Datei steht
- cURL Funktionen

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open